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  <title>Create a subscription to a specified topic.</title>

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  <h1 class="refname">SAMConnection::subscribe</h1>
  <p class="verinfo">(PECL sam &gt;= 0.1.0)</p><p class="refpurpose"><span class="refname">SAMConnection::subscribe</span> &mdash; <span class="dc-title">
   Create a subscription to a specified topic.
  </span></p>

 </div>

 <div class="refsect1 description" id="refsect1-samconnection.subscribe-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="type">string</span> <span class="methodname"><strong>SAMConnection::subscribe</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$targetTopic</code></span>
   )</div>

  <p class="para rdfs-comment">
   The &quot;subscribe&quot; method is used to create a new subscription to a specified topic.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-samconnection.subscribe-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<em><code class="parameter">targetTopic</code></em></dt>

     <dd>

      <p class="para">
       The identity of the topic (topic://topicname) to subscribe to.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-samconnection.subscribe-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   A subscription identifier that can be used in a subsequent receive call as
   a selector to obtain any topic data or <strong><code>FALSE</code></strong> if an error occurred. The
   subscription identifier should be used in the receive call in place of the
   simple topic name.
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-samconnection.subscribe-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-4446">
    <p><strong>Example #1 Subscribe to a topic</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$subid&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">$conn</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">subscribe</span><span style="color: #007700">(</span><span style="color: #DD0000">'topic://A'</span><span style="color: #007700">);<br />if&nbsp;(!</span><span style="color: #0000BB">$subid</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;</span><span style="color: #FF8000">//&nbsp;The&nbsp;subscribe&nbsp;failed!<br />&nbsp;&nbsp;</span><span style="color: #007700">echo&nbsp;</span><span style="color: #DD0000">"Subscribe&nbsp;failed&nbsp;(</span><span style="color: #0000BB">$conn</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">errno</span><span style="color: #DD0000">)&nbsp;</span><span style="color: #0000BB">$conn</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">error</span><span style="color: #DD0000">"</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-samconnection.subscribe-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><a href="samconnection.unsubscribe.html" class="xref">SAMConnection::unsubscribe</a></li>
   </ul>
  </p>
 </div>


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